Stainless Steel Bento Lunch Box, Airtight Leak Proof Food Container - Metal Food Carriers and Lunch Boxes by Happy Tiffin Stainless Steel Bento Box: Inserts create four even sections inside to support portion control or separation of foods like bento boxes. Leak Proof: Three metal latches on the lid ensurage a watertight, airtight silicone seal. A Durable Lunchbox: This lunch box is made of food safe stainless steel and measures 8" in diameter and 2" deep. Food to Go: Functional enough as your adult lunch box and sophisticated enough for bringing your appetizer or deserts to the dinner party.